How to reduce the ratio mao/metallocene | Zendy

Kaminsky W. | Zendy

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How to reduce the ratio mao/metallocene

Author(s) -

Kaminsky W.

Publication year - 1995

Publication title -

macromolecular symposia

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.257

H-Index - 76

eISSN - 1521-3900

pISSN - 1022-1360

DOI - 10.1002/masy.19950970108

Subject(s) - metallocene , bimetallic strip , cyclopentadienyl complex , materials science , polymer , post metallocene catalyst , polymer chemistry , catalysis , chemistry , organic chemistry , polymerization , composite material

The optimal ratio of Al/Zr in Metallocene/Methylalumoxane catalysts lies between 5000 to 10000. Bimetallic deactivation reactions and equilibria are responsible for this high excess. Substitution at the cyclopentadienyl or indenyl ligands can decrease the possibility for a hydrogen transfer and deactivation resulting in higher activity, higher molecular weights of the polymers and less excess of MAO. The MAO/metallocene ratio can also be reduced by supporting the metallocene on silica.

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